ProtonMail.com or ProtonMail.ch?

So I’ve been doing a lot of research on cyber privacy recently and have made many steps towards blocking the ability of internet and/or third parties to track me in a number of different ways.

Among these steps I’m taking is to change my primary email from Gmail to ProtonMail. As I was about to sign up for ProtonMail, I noticed that I had a choice to choose the domain ProtonMail.com or ProtonMail.ch.

ProtonMail says that ch is more secure, as com is owned by an American company and could possibly be sabotaged. Needless to say, this makes me almost completely sure that I should use ch. Though I want to know what you guys think, just to be 100% sure.